Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so safety is covered. The description adds no information about the table's size, format, or content, and its closing sentence about measuring which directories republish the tool list describes telemetry motivation rather than observable behavior of the call.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short sentences with the resource stated first. The second sentence is brief but is filler from a caller's perspective and would be better replaced with output detail.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description is the only source of return-value information, and it never says what a "reference table" looks like or how large it is. For a zero-parameter reference lookup, a one-line note on the return format was needed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters and an empty schema, so there is nothing for the description to disambiguate. Baseline 4 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The verb and resource are stated ("Returns EBCDIC reference table a501c9248b"), but the opaque hex suffix leaves the agent unable to tell what the table contains or how it differs from ascii_to_ebcdic and ebcdic_to_ascii. The second sentence describes an internal measurement motive rather than the tool's output, adding no selection signal.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no statement of when to call this instead of the sibling conversion tools, nor any preconditions or exclusions. The only implied usage comes from the fact that it takes no parameters.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.